how to change `cols = %w(black, brown, red)` to this: `cols = { "black" => '0', "brown" => '1', "red" => '2'}` in ruby

To convert the array cols = %w(black brown red) to the hash cols = { "black" => '0', "brown" => '1', "red" => '2' } in Ruby, you can use the each_with_index method along with the to_h method.

Here's the code to achieve this conversion:

main.rb
cols = %w(black brown red)
cols = cols.each_with_index.map { |color, index| [color, index.to_s] }.to_h

puts cols
114 chars
5 lines

Output:

main.rb
{"black"=>"0", "brown"=>"1", "red"=>"2"}
41 chars
2 lines

In this code, each_with_index is used to iterate over the elements of the cols array along with their respective indices. For each element, a new array is created with the color as the key and the index converted to a string as the value. Finally, to_h is used to convert the resulting array of arrays to a hash.

Note that the order of elements in the resulting hash may not be the same as the original array since hashes do not preserve order in Ruby.